HP 4600 Service Manual - Page 148
Printer memory, Read-only memory, Random-access memory
UPC - 808736060875
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Printer memory If the printer encounters difficulty managing available memory, a clearable warning message will appear on the control panel. Some printer messages are affected by the auto-continue and clearable warning settings from the Configure Device menu, under System Setup. If Clearable Warning = Job is set on the control panel, warning messages appear on the control-panel display until the end of the job from which they were generated. If Clearable Warning = On is set, warning messages appear on the control panel until (HP Color LaserJet 4600 models) or MENU (HP Color LaserJet 4610n and 4650 models) is pressed. If an error occurs that prevents printing and Auto Continue = Off is set, the message appears until (HP Color LaserJet 4600 models) or MENU (HP Color LaserJet 4610n and 4650 models) is pressed. Read-only memory Besides storing microprocessor control programs, the read-only memory (ROM) stores dot patterns of internal character sets (fonts). Random-access memory The random-access memory (RAM) contains the page, I/O buffers, and the font storage area. It stores printing and font information received from the host system, and can also serve to temporarily store a full page of print-image data before the data is sent to the print engine. Memory capacity can be increased by adding DIMMs to the formatter. Note that adding memory (DIMMs) might also increase the print speed for complex graphics. DIMM slots (HP Color LaserJet 4600 Series printer) The DIMM slots can be used to add memory, fonts, or firmware upgrades. Firmware DIMM (HP Color LaserJet 4600 models) To upgrade printer firmware, install a new firmware DIMM (firmware DIMMs are flashable). See Installing memory and font DIMMs (HP Color LaserJet 4600 models) for more information. Flash memory (HP Color LaserJet 4610n and 4650 models) To upgrade printer firmware, install a new firmware Compact FLASH. See Installing memory (HP Color LaserJet 4610n and 4650 models) and fonts (HP Color LaserJet 4650 models) for more information. Nonvolatile memory The printer uses nonvolatile memory (NVRAM) to store I/O and information about the print environment configuration. The contents of NVRAM are retained when the printer is turned off or disconnected. 132 Chapter 5 Theory of operation ENWW